Preheat the oven to 350°F and line a large rimmed sheet pan with aluminum foil.
Place the flank steak, bell peppers, onions, jalapeño, garlic on the baking sheet. Grate lime zest over all of the ingredients.
Sprinkle the fajita seasoning and vegetable oil over all ingredients and toss gently.
Bake for 15 minutes for until the beef is desired doneness. Remove and allow to rest for 5 minutes.
Evenly divide the beef and vegetables into each small flour tortilla and top with ranchero sauce and desired garnishes.
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